Steam-boiler.



H. 3-. BLACK.

STEAM BOILER. APPLICAH N map 0c. 21. l91 2.

Patented Man-"1 1,- 1915,

2 sunrs-sne'n' l.

00 OO OOO OOO INVENTOR ATTORNEY.

H. B. BLACK.

' STEAM BOILER. APPLICATION FILED DEC- 21. I912 Patented Mar. 14Q'1916.

2 SHEETS-SHEET 2.

, HARVEY B. BLACK, or BoGoTA, NEw JERSEY.

STEAM-B OILER.

Specification of Letters Patent.

Application filed December 27, 1912. Serial No. 738,796.

To all whom it may concern: I v

Be it known that I, HARVEYB. BLACK, a

citizen of the United- States, residing at Bogota, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in Steam-Boilers,

- of which. the following is a full, true, and

completespecification.

This invention comprises a steam boiler furnace of the variety having a boiler shell, dependingwater legs or headers, and a nest of water tubes connecting the water legs and located above the grate, the furnace gases passing between and around the water tubes on their way to the Stack.

The object of the invention isto construct and combine the elements of the boiler and furnace so as to provide an improved course for the furnace gases from the fire-box through the combustion chamber filled with water tubes. The flow of the gases is controlled and directed by means of baflies of such construction, and supported on the water tubes in such manner, as to render them easy of application, adjustment and repair.

In-the accompanying drawings illustrating the, invention: Figure 1 is'a vertical transverse section, parts being illustrated conventionally and Fig. 2 is a side elevation, parts being broken away and omitted.

The boilercomprises ashell or drum 1O disposed longitudinally at the top of the boiler I setting, depending front and rear water legsll and 12, of any suitable construction, and water tubes 13 connecting the water legs. The combustion chamber containing the tubes 13 is bounded at front and back by the water legs 11 and12, and at the sides by the side walls of the furnace setting.

.The grate 20 extends across the furnace, be-

low the combustion chamber, and may be of any suitable construction. For simplicity it' is indicated diagrammatically. As shown 111.

Fig. 2 there may be two grates arrangedend to end or back to back, their adjacent. portions being supported on an abutment 14,

strict theup-fiow of the furnace gases from the burning charge, and thus concentrate their action upon the central grou of Water.

tubes. Other lagging plates -1 having their upper portions curved or hooked, are hung one above the other in overlapping relation on the side members of this central group of water tubes and thus formtwoinner spaced baflles which extend between the water legs and from the inner edgesof the horizontal baflles upward toward, but not to, the shell 10. The lagging baffles 17 thus constitute the side walls'of an up-draft flue disposed directly over the central portion of the grate and extending from end to end of the combustion chamber. This flue, together with the space over the grate be-- low the horizontal lagging bafiles 16, form in effect an inverted T-s'haped primary com- Patented Mar. 14,1916.

bustion chamber. The shell 10- extends longitudinally over the opentop of the central flue, and its under side is exposed to theaction of the gases as they flow upward in the sides.

All of the furnace gases flow upward in the central flue,impinge againstthe under side of the shellj10,'and divide into two streams which flow downward at oppositesides of the central'flue, between and around more ofthe water tubes, andthence upward atthe outer sides over the remainder of the tubes. v two streams in the spaces at opposite sides of the central flue and over the grate, but separated from the latter by the horizontal .the flue and reverse to move downward at In orderto direct the flow of these.

lagging 16, outer baffles 18, similar to the baflles 17, are provided. At the bottom these baflles terminate short of the horizontal baffles '16 and at the top they are: extended l to meet thesides of the shell 10. The space between the sides of the shell and the hooked baflies 18, which are supported on the uppermost tubes, is bridged by suitable plates 18*. The down-draft and up-draft fines thus formed at opposite sides of the central flue are of} relatively small cross-sectional area, preferably less than halfthe area of the central flue, in order to preserve the velocity of flow by compensating for the, de-v creased bulk. of .the gases. due to cooling.

The upper portions of the outer bafiles are provided on top with channeled recesses,

which channels in the innermost .plates receive the lower edges of the bottom plates 17 to secure a lap joint at this junctiom It will thus be observed that the flame and gases from the burning charge are collected and caused to flow up in'a single body over the central group of tubes; that the flow is divided at the top of the central flue into two streams, which are directed reversely in the side flues, passing over the remainder of the tubes and finally escaping into the space 19 at the top and sides of the boiler casing, whence they are'allowed to escape to the stack in any suitable manner.

I claim: V w

1. In a boiler furnace, the combination of a grate, a boiler drum, downward-extending water legs at opposite ends of said drum, water tubes connecting said water legs, central spaced baflles supported on and parallel with the water tubes and extending upward toward said drum so as to form a central up-draft flue extending between the water "legs directly over the central portion of the grate, said drum forming the topof said flue, substantially horizontal baflles support- 7 ed on the lower side water tubes and coopcrating with the aforesaid-baffles to separate the spaces at the sides'of said central flue from the grate, and'baflles in said spaces supported on and parallel with the water tubes therein and dividing said spaces into down-draft and up-draft flues of relatively small area, all the furnace gases flowing up in the central flue to the drumand thence dividing and passing downward and upward through the side flues.

2. In aboiler furnace, the-combination with a boiler drum, downward-extending waterlegs at theends thereof, and watertubes connecting said water legs, of lagging plates supported on said water tubes and forming baflles constituting the side walls of a central up-draft fluebeneath said drum, which drum extends longitudinally of the top of the flue exposed to the upward flow of combustion gases therein, other lagging plates supported on thewater tubes and forming baffles at opposite sides' of the aforesaid baflles, these side baffles extending downward from the sides of said drum and constituting the division walls between down-draft and updraft flues which communicate with the top of said central flue,

and horizontal baffle plates supported on the lower side water tubes and forming baffles extending from the sides of the furnace to the lower edges of the side baflles 3. In a boiler furnace, the combination with a boiler drum, downward-extending water legs at the ends thereof, and water tubes connecting said water legs, of inner baflies supported on'the water tubes and extending between the water legs and upward toward said drum to form a central u -draft flue filled with tubes, the drum forming the top of this flue, outer baflles supported on the water tubes meeting the sides of said. drum and extending downward in the spacesat the sides of the central flue to separate said spaces into down-draft and up-draft flues, connected with the top-of the central flue, and substantially horizontal bafiles supported on the lower water-tubes at opposite sides of the bottom of the central flue and forming the bottom walls of the side-flues.

4. In a boiler furnace, the combination with a boiler drum, water legs at the ends thereof, and water tubes connecting said waterlegs, of inner "baflles extending between said water legs and upward toward but not to said drum, outer baflles the upper portions of which are inclined inward'with reference to the lower portions and meet the sides of said drum, and bottom b aflles extending from the lower edges of the inner bafiles across below the lower edges of the outer bafiles, said baflles forming-a central up-draft flue extending upward to thedrum and side down-draft and up-draft flues which divide the -combustion gases from the central flue into two streams, said flues containing the water tubes.

In testimony-whereof, I' have signed this I specification in the presence of two wit- "nesses. I

HARVEY B. BLACK.

Witnesses: I

JOHN B. BLACK, L. W. CRoUsE. 

